We know that the speed of light is 300,000,000 m/s and that Earth is 150,000,000 km from the Sun. To find out how long it takes for light from the Sun to reach Earth we first need to convert 150,000,000 km into m, then we need to that number by the of light. The answer we get is s, which is the same as about 8.3 .

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos